某外商到一开放区投资72万美元建起一座蔬菜加工厂,第一年各种经费12万美元,以后

题型:解答题

问题:

某外商到一开放区投资72万美元建起一座蔬菜加工厂,第一年各种经费12万美元,以后每年增加4万美元,每年销售蔬菜收入50万美元.

(1)若扣除投资及各种经费,则从第几年开始获取纯利润?

(2)若干年后,外商为开发新项目,有两种处理方案: ①年平均利润最大时以48万美元出售该厂;②纯利润总和最大时,以16万元出售该厂,问哪种方案最合算?

考点:等差数列的定义及性质等比数列的定义及性质
题型:解答题
设各项均为正数的等比数列的前n项和为Sn,若S10=2,S30=14,则S40等于

A.80
B.30
C.26
D.16
题型:解答题

指出下列句子的修辞方法。     

(1)桂林的山真秀啊,像翠绿的屏障。   (           )     

(2)桂林的山真奇啊,一座座拔地而起,各不相连,像老人,像巨象,像骆驼。     (           )     

(3)虽然天山这时并不是春天,但是有哪一个春天的花园能比得过这时天山的无边繁花呢?   (           )

题型:解答题

郑州期货交易所采用的交易指令为限价指令和取消指令;上海期货交易所采用的交易指令分限价指令、市价指令、套利指令。( )

题型:解答题

A/G比例倒置

A.急性心肌梗死
B.肝硬化
C.原发性肝癌
D.急性胰腺炎
E.前列腺癌

题型:解答题

假设你是育才中学学生会 * * 李华。针对目前一些地方血库纷纷告急这一情况,请参照以下提示,用英文写一份倡议书,提倡无偿献血(donate blood for free)。

● 社会上对献血的错误认识;

● 指出献血的意义;

● 开展相关活动。

注意:

1.字数120—150;

2.可以适当增加细节,以使行文连贯;

3.开头与结尾已为你写好。

***********************************************************************

Boys and girls,

Recently some blood banks across the country are reported to be short of blood supplies.                                                                            

                                                                                  

                                                                                  

                                                                                  

                                                                                  

                                                                                  

                                                                                  

                                                                                  

                                                                                  

                                                                                  

                                                                                  

                                                                                  

                                                                                  

                                                                                  

Students Union

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